At the end you tidy up what's not consumed (7)
I believe the answer is:
uneaten
'not consumed' is the definition.
(I've seen this before)
'at the end you tidy up' is the wordplay.
'at the end' says to take the final letters.
'tidy up' becomes 'neaten' (synonyms).
The last letter of 'you' is 'u'.
'u'+'neaten'='UNEATEN'
'what's' is the link.
(Other definitions for uneaten that I've seen before include "Left on the plate" , "Not taken in" , "not chewed" , "still on the table?" , "Left after dinner" .)